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Frequently Asked Questions

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Francois Bedard edited this page Jun 15, 2015 · 13 revisions

  • Q: How to change heap and stack size in baremetal applications?

    A: To change size of heap in baremetal applications the following option should be specified to the linker: --defsym=__DEFAULT_HEAP_SIZE=${SIZE}, where ${SIZE} is desired heap size, in bytes. It also possible to use size suffixes, like k and m to specify size in kilobytes and megabytes respectively. For stack size respective options are --defsym=__DEFAULT_STACK_SIZE=${STACK_SIZE}. Note that those are linker commands - they are valid only when passed to "ld" application, if gcc driver is used for linking, then those options should be prefixed with -Wl. For example:

    $ arc-elf32-gcc -Wl,--defsym=__DEFAULT_HEAP_SIZE=256m
-Wl,--defsym=__DEFAULT_STACK_SIZE=1024m hello.o -o hello.bin

    Those options are valid only when default linker script is used. If custom linker script is used, then effective way to change stack/heap size depends on properties of that linker script - it might be the same, or it might be different.

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